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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |  |
Short-term investment maturity period |  | 3 months |  |
Restricted cash |  | $ 10,010 | $ 10,000 |
Weighted average number of common shares outstanding |  | 8,209,539 | 7,564,082 | 7,413,602
Redeemable preferred stock outstanding |  | 0 |  |
Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Lease term | 12 months |  |  |
Property and Equipment, estimated useful life |  | 3 years |  |
Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, estimated useful life |  | 30 years |  |

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